Im haveing engine problems with my 91 pathfinder

Im haveing engine problems with my 91 pathfinder and cant seem to figure it out. it runs fine when i first start it up but after i drive it more then a few miles it starts sputtering and back firing when i give it gas, ive takein it to a mechanic and he couldnt figure it out, wonderin if you guys might have any ideas.

Might want to check that the timing is all the way dialed in, and that there are no vacuum leaks on the intake manifold. Spritz starting ether over the manifolds, if it speeds up, that needs resurfacing, if not, spritz it over the intake manifold-throttle body gasket, if it speeds up RPM then, it needs a new gasket. Otherwise, make sure injectors are clean, and the computer is giving the right amount of fuel.

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If its a vac hose it will have vac in it when the engine is running, or you will have a pipe on the intake pulling air where the hose is supposed to connect.
You may be able to look at a similar vehicle to figure out where the hose goes.

Once you have the engine running, place a volt meter across the battery and measure the voltage while you run the engine at about 2000 rpm. The volt meter should read in the region of 14.5 volts. If it is below 14 volts your alternator is not charging and needs attention. Also, after the battery has been used for a while and you switch the lights on, they should brighten slightly as you rev the engine, if they do not, the alternator is definitely not working.

There could be several concerns.
The fuel pump is weak and cutting out.
The ignition coils are getting hot and cutting off. The torque convetor in the transmission could be staying in lock up mode, This will cause the vehicle to die out , there is to much torque on the engine when at idle, causing the engine to die out.
The exhaust system could be clogged.
I would try and get the vehicle to a mechanic or dealer to check out .